Kensington KeyFolio Bluetooth Keyboard and Case Source
Advantage:
Input is easier when needed.
Compact and convenient.
Can be discarded when not needed.
Sometimes touck keyboard is annoying or uncomfortable.
Disadvantage:
Can be lost.
Is additional weight.
Scroll wheel
A scroll wheel (or mouse wheel) is a hard plastic or rubbery disc (the "wheel") on a computer mouse that is perpendicular to the mouse surface. It is normally located between the left and right mouse buttons.
Functionality
It is used, as the name suggests, for scrolling. It can also be used as a third mouse button by pressing on it. Some
modern mice can scroll horizontally as well as vertically, using either a tilting scroll-wheel (introduced by Microsoft) or a scroll ball
(found on Apple's Mighty Mouse). Logitech MicroGear mice (like the MX Revolution and the VX Revolution) use a 14 gram scroll wheel which can preserve the moment of inertia like a flywheel and can be used to quickly scroll through long pages and lists. The Orbita mouse by Cyber Sport takes a new approach with its continuous scrolling capability, achieved by employing the whole round mouse as a scroll wheel which rotates on a ball bearing base.
Other applications
In many applications (e.g. web browsers), holding down the control key while rolling the scroll wheel causes the text size to increase or decrease, or an image in an image-editing or map-viewing program to zoom in or out, if such a feature is available.
In many first-person shooter (FPS) games, the scroll wheel is usually set to change weapons. Because of this some gaming mice, such as Logitech G500, implement a locking feature that lets the mouse switch between scrolling in steps (needed for gaming) and continuous scrolling (good for web browsing). The scroll wheel is also sometimes used to control the zoom of scoped weapons and binoculars. FPS games with an emphasis on realism may choose to use the wheel for changing between stances. Since the introduction of tilting scroll-wheels, many FPS games use the left-right motion of the scroll wheel to cause the player to lean left and right. A less common use is to use the mouse wheel to adjust the player's speed of movement.
Real time strategy games use the mouse wheel to change the altitude of the camera. Many RTS games also allow control of the camera with the scroll wheel button held down causing the view to either tilt or pan with mouse movement.
What do we assign to it here? Usually one of two things: horizontal scrolling or volume control.
Some phones like the Nokia E72 may have an optical sensor which fulfills the function of the thumb wheel.
A thumb wheel is essentially a circle surrounded by buttons.
Multitouch
Multi-touchrefers to a touch sensing surface (either a keyboard or a touchscreen) that can recognize the presence of two or more points of contact with the surface. Although at first sight it might not seem like a very useful feature it allows many new features to be added to the keyboard, such as allowing the user to change between upper and lower case, as well as allowing special characters to be added such as accents or symbols. Recently the use of virtual keyboards that are simply displayed on touchscreens allows the user to use multi-touch.
Keyboard
Detachable Keyboard:Source
Advantage:
Input is easier when needed.Compact and convenient.
Can be discarded when not needed.
Sometimes touck keyboard is annoying or uncomfortable.
Disadvantage:
Can be lost.Is additional weight.
Scroll wheel
A scroll wheel (or mouse wheel) is a hard plastic or rubbery disc (the "wheel") on a computer mouse that is perpendicular to the mouse surface. It is normally located between the left and right mouse buttons.It is used, as the name suggests, for scrolling. It can also be used as a third mouse button by pressing on it. Some
modern mice can scroll horizontally as well as vertically, using either a tilting scroll-wheel (introduced by Microsoft) or a scroll ball
(found on Apple's Mighty Mouse). Logitech MicroGear mice (like the MX Revolution and the VX Revolution) use a 14 gram scroll wheel which can preserve the moment of inertia like a flywheel and can be used to quickly scroll through long pages and lists. The Orbita mouse by Cyber Sport takes a new approach with its continuous scrolling capability, achieved by employing the whole round mouse as a scroll wheel which rotates on a ball bearing base.
Other applications
In many applications (e.g. web browsers), holding down the control key while rolling the scroll wheel causes the text size to increase or decrease, or an image in an image-editing or map-viewing program to zoom in or out, if such a feature is available.
In many first-person shooter (FPS) games, the scroll wheel is usually set to change weapons. Because of this some gaming mice, such as Logitech G500, implement a locking feature that lets the mouse switch between scrolling in steps (needed for gaming) and continuous scrolling (good for web browsing). The scroll wheel is also sometimes used to control the zoom of scoped weapons and binoculars. FPS games with an emphasis on realism may choose to use the wheel for changing between stances. Since the introduction of tilting scroll-wheels, many FPS games use the left-right motion of the scroll wheel to cause the player to lean left and right. A less common use is to use the mouse wheel to adjust the player's speed of movement.
Real time strategy games use the mouse wheel to change the altitude of the camera. Many RTS games also allow control of the camera with the scroll wheel button held down causing the view to either tilt or pan with mouse movement.
for more information go to:http://en.wikipedia.org/wiki/Scroll_wheel
Thumb wheel
What do we assign to it here? Usually one of two things: horizontal scrolling or volume control.Some phones like the Nokia E72 may have an optical sensor which fulfills the function of the thumb wheel.
A thumb wheel is essentially a circle surrounded by buttons.
Multitouch
Multi-touchrefers to a touch sensing surface (either a keyboard or a touchscreen) that can recognize the presence of two or more points of contact with the surface. Although at first sight it might not seem like a very useful feature it allows many new features to be added to the keyboard, such as allowing the user to change between upper and lower case, as well as allowing special characters to be added such as accents or symbols. Recently the use of virtual keyboards that are simply displayed on touchscreens allows the user to use multi-touch.
Touch Screen